Why does LongSummaryStatistics implements IntConsumer?












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Why does LongSummaryStatistics implements IntConsumer when there is IntSummaryStatistics which also implements IntConsumer?






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    7














    Why does LongSummaryStatistics implements IntConsumer when there is IntSummaryStatistics which also implements IntConsumer?






    java java-8 java-stream







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      Why does LongSummaryStatistics implements IntConsumer when there is IntSummaryStatistics which also implements IntConsumer?






      java java-8 java-stream







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      Why does LongSummaryStatistics implements IntConsumer when there is IntSummaryStatistics which also implements IntConsumer?






      java java-8 java-stream




      java java-8 java-stream






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      edited 2 hours ago









      Stefan Zobel

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      asked 2 hours ago









      mkjh

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          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.






          share|improve this answer



















          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            1 hour ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            1 hour ago






          • 1




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            1 hour ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            1 hour ago











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          1 Answer
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          1 Answer
          1






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          active

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          active

          oldest

          votes









          9














          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.






          share|improve this answer



















          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            1 hour ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            1 hour ago






          • 1




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            1 hour ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            1 hour ago
















          9














          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.






          share|improve this answer



















          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            1 hour ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            1 hour ago






          • 1




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            1 hour ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            1 hour ago














          9












          9








          9






          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.






          share|improve this answer














          LongSummaryStatistics implements IntConsumer in order that it can accept int values as well as long values.



          For example, this allows you to pass it to a method requiring an IntConsumer in order to consume some int data abstractly:



          LongSummaryStatistics lss = new LongSummaryStatistics();
          
someMethod(lss);
          

          
void someMethod(IntConsumer consumer) { ... }


          There's no real reason why a LongSummaryStatistics shouldn't be usable for this purpose: int can always be widened to long without loss. However, the type system wouldn't allow lss to be used as a parameter to someMethod unless LongSummaryStatistics implemented IntConsumer directly.



          True, you could do this without implementing the interface, using a lambda:



          someMethod(i -> lss.consume(i));


          but it's just a bit neater to use the reference directly.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 1 hour ago

























          answered 2 hours ago









          Andy Turner

          80.3k879133




          80.3k879133








          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            1 hour ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            1 hour ago






          • 1




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            1 hour ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            1 hour ago














          • 1




            A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
            – nullpointer
            1 hour ago






          • 1




            @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
            – Andy Turner
            1 hour ago






          • 1




            I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
            – Andy Turner
            1 hour ago












          • True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
            – nullpointer
            1 hour ago








          1




          1




          A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
          – nullpointer
          1 hour ago




          A follow-up question that comes to my mind, why not separate them out, why let consumers define separate streams of int and long and then mix them?
          – nullpointer
          1 hour ago




          1




          1




          @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
          – Andy Turner
          1 hour ago




          @nullpointer try defining a class which doesn't implement IntConsumer, and then pass it to a method which requires an IntConsumer parameter.
          – Andy Turner
          1 hour ago




          1




          1




          I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
          – Andy Turner
          1 hour ago






          I don't understand what you mean by "why let consumers define separate streams of int and long and then mix them"? Streams are not the only sources of data for *SummaryStatistics, you can invoke the methods directly.
          – Andy Turner
          1 hour ago














          True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
          – nullpointer
          1 hour ago




          True, and when invoking the *SummaryStatistics directly too, why should one be collecting stats for varied type(int at once and long at another) of data is what I am thinking about. Maybe thinking too much there, but seemingly an example would cool down my thought process I guess.
          – nullpointer
          1 hour ago


















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